The maintenance work of the crane involves many aspects of careful inspection and maintenance. Here are a few key checkpoints: First, perform a general inspection to ensure that all line connections and fixed seals are free of loose or leaking oil. At the same time, carefully check whether the fasteners are firm, especially the connection between the beam, the chassis beam, the rotary bearing and the beam and the column. In addition, the inner and outer ring bolts on the slewing support should be tightened according to the specified tightening torque to ensure safety and stability. Secondly, check whether the load extractor control switch and pressure gauge are working properly to ensure smooth and accurate operation. At the same time, it is also necessary to check the adequacy of hydraulic oil and lubricating oil to ensure the normal operation of the hydraulic system. In addition, the use of the wire rope and accessories is also an important inspection content, including the firmness of the rope card and the wear and rust of the wire rope. Once the wire rope is found to have kinks, creases, severe wear, rust, excessive wire breakage or excessive diameter reduction and other abnormal conditions, should be replaced in time with a new wire rope. Finally, it is also necessary to check whether there is damage or deformation on the surface of each crane component, and the tightness of the synchronous wire rope. While making the crane in the working state, it is also necessary to monitor the sound of the hydraulic system and monitor the temperature to ensure its normal operation.